Car blocking a compulsory bike lane = tell Police Scotland, save the incident number and call the City traffic dept on 0800 23 23 23 / 0131 200 2000. If you have time you can also come to a stop behind the vehicle and patiently wait for it to go away.

Car blocking an advisory bike line = there is nothing you can do about this insane policy

Vehicle idling but not moving = protest by standing or sitting peacefully until it goes away. If it's a commercial object call the company

Vehicle obstructing a pavement = tell Police Scotland and save the incident number. You can also take a photo, sit or stand in the vicinity until it goes away and/or leave a polite note reminding the person responsible that pavements are for walkers, wheelchair users and children not their bulky pointless heaps of steel/polythene

Someone going too fast in an oil-/electricity-powered object particularly in densely populated area = tell Police Scotland and write down the incident number

Horn to intimidate / pass too close = tell Police Scotland and write down the incident number

Person on a bike going through a red light = call it out at the time, and then let Police Scotland know and write down the incident number